The Chicago Cubs (1870), however, the Toronto Argonauts (1873) are the oldest not to change their name.
The Toronto Argonauts.
Cincinnati Reds (originally known as the Cincinnati Red Stockings), who became the first fully professional baseball team in 1869.
The Green Bay Packers.
Click on the 'Cincinnati Red Stockings' link on this page to read about the history of the oldest professional team in America.
Manchester United - 1878
The Chicago Bears
The title of oldest professional football club in America actually goes to the The Chicago Cardinals. The team formed in 1899, before the NFL was created.
The Toronto Argonauts are one of the oldest teams
The Cincinnati Reds, is recognized as the first "professional" baseball team.
i believe it is because they are the first, and oldest continually operating professional baseball team in America
The New York Giants